Display API credit balances for 5 core providers (Anthropic, OpenAI, OpenRouter, Mistral, Groq) with video game style health bars. API auto-checks and manual sync.

显示五大核心提供商（Anthropic、OpenAI、OpenRouter、Mistral、Groq）的API信用余额，采用电子游戏风格的生命值条。支持API自动检查与手动同步。